Tool post



H. HALDY.

TOOL POST.

APPLICATION FILED MAR. Io, 1920.

Patented Mar; 7, 1922.

vumTlezD STATES PATENT OFFICE.

HENRI HARDY, or WALTHAM, MASSACHUSETTS, AssIGNoR To STARK TOOL com- RANY, or -WALTHAM MASSACHUSETTS, A CORPORATION or MASSACHUSETTS.

TOOL POST.

To all 'whom z'tmay Concern.' Y Bevitknown that I, HENRI IIALDY, a citizen of the United States, residing at Waltham, inthe county of Middlesex and State of h/Iassachusetts, have invented an Improvement in Tool Posts, of which the following isla-specification. l Y

*This invention relates to tool-posts for lathes and has for its object to improve the construction and facilitate the manipulation of the tool-post and,specifc-al ly, to provide a'tOol-postwith means admitting `of clamping the tool at variousv inclinations with respect to the slide resty thereon and withhan enclosedand lthereby protected binding screw.

In carrying out myvinvention, I provide the tool-post with a lower base and clamp'- ingI-member and an upper movable clamping-member disposed about and enclosing .and therebyV protecting the binding-screw.

The two clamping-members are arranged to receive and clamp a tool between themat one side of the binding-screw. I vprovide clamping-pressure compensating means 1n the form of a resilientspring between the two members on the opposite side of the 'binding-screw from the-tool'clamping portionof the tool-postwhereby to relieve the tool-post from cramping or vbending strains and I also providera guiding-means between the two members whereby, assisted by the binding screw, the upper clamping-member may'move toward or away from the lower `clamping-member and be restrained from angular movement; and this comprises a second'obj ect of my invention.

Fig. 1 is a/side'elevationA of a tool-post embodying my invention,

Fig. 2 is an end elevation of Fig. 1, i Fig. 3 is a transverse sectional elevation of the tool-post,

' Fig. 4 is a plan view ofthe base member with the movable clamping-member removed,

Fig. 5 is fa sectional det-ail along line 5-5 of Fig. 4,

Fig. 6 is a plan view of the lower face of the movable clamping member.

As here shown the tool-post constructed in accordance with my invention comprises the lower clamping oi base member 10 and the upper clamping-member 11 between which and to one Side of the binding screw the tool is adapted to be clamped.

The base member 10 comprises a prefer- Specification of Letters Patent. Application filed March 10, 1920. Serial No.

'above to Patented Mar. 7, 1922. 364,772.

ably square block of substantial thickness having a relatively large lower bearing face to engage the face of the slide rest13 whereby the tool-post may be firmly supported thereabove. Said block has the hole 14 therethrough in which the vertical bindingscrew l2 is disposed and extended thereabove to support'themovable clamping member.

rIhe base-member 10 is formed with a. recess 16 therein having a circular bottom at one side of the binding-screw and a clamping-jaw 17' having the flat top face 17a and the corresponding circular lower face 1'?b is inovably received therein whereby to form a self-centering seat for the tool and admit of holding' the tool at various inclinations with respect to the face ofthe slide-rest. A screw 18 loosely extended through the elongated Slot 19 in said base member into said jaw serves to retain the jaw in place and permit its necessary sliding movement.

A guide-pin20 is fixed in said base-inem` ber on the opposite side of the binding-screw from the clamping-jaw and extends therereceive and guide the upper clampin g-in einher.

' The upper-clamping member 11 is'formed as a cylindrical block having the central hole 2l therethrough in which the binding-screw is extended and on which it is supported and guided. A cylindrical recess 22 is formed in the lower portion of said clamping-niember on one side of the binding-screw in which the guide-pin 20 of the base-member is received and by which it is also guided and supported. A compression spring 23 is received inl said recess above said guide-pin and engages the top of said pin and the bottom. wall of the recess. When a tool is clamped in the tool-post the spring is adapted to be compressed thereby to support the upper clamping-member against the clamping pressure.

The spring, in effect, forms a yielding fulcruin for the upperl clamping-member and counterbalances the clamping pressure on the tool and thereby reduces the tendency of the clamping member 11 to about the bolt 12 as a fulcrum.

The upper clamping-member is formed with a Vtool-receiving recess extending from end to end of it on the opposite side of the binding screw from the spring, having the fiat vertical face 24 against which the tool is adapted to rest. A clamping pin 25 is uit naif-illy 25a and the self-seating clamping-jaw 17 a f binding-screw,

tool may be securely gripped therebetween vat an inclination with the face ofthe slide rest as indicated in the dotted lines, Fig. 1.

Said binding screw 12 extends above the upper clamping member 11 and is threaded in the recess 26 of the nut 27 by which said upper clamping-member is forced into engagement with the tool. In clamping a tool in the tool-post the rotation of said nut 27 moves the upper clamping-member into engagement with the tool and also compresses the spring 23, and

the spring pressure assists materially inV supporting the clamping member against lateralor rocking movement; and also serves to raise the clamping-member away from the tool when the nut 27 is reversely rotated.

I claim: Y 1. A tool-post for lathes comprising a binding-screw and upper and lower clamping-,members movable thereon to engage and c lampV a toolbetween them having tool-engaging means on one side of the binding screw, and guiding means extended between said clamping-.members on the other side vof the binding-screw including resilient means arranged, yieldingly to support the upper clamping-member above the lower clamping-member and reduce its tendency toward lateral deflection underthe clamping pressure.

2. A tool-post n for lathes comprising a binding-screw, upper and lower clamping members movable thereon to engage vand clamp a tool between them each having toolclamping means on one side of the bindingscrew, a guidepin extended above the lower clamping-member on the opposite side of the binding-screw, said upper clamping-member having a recess in which said pin is slidably received, and a compression spring disposed in the recess between the end of said pin and the bottom of the recess. u

3. A tool-post for lathes comprising a upper and lower clampingmembers movable thereon to clamp a tool between them, said lower clamping-member having a slot with a circular bottom in its upper face on one side of said bindingscrew, a clamping]aw having a circular bottom'face movably received in saidV recess,

said upper clamping-member having a toolreoeiving recess extended from end to end of it, on the same side of the'binding-screw, a

clamping pin tool-engaging said two clamping-members ontheopposite.

side of said binding-screw. l

4L. A tool-post for lathes comprising a binding-screw, upper and lower clampingf members movable thereon to clamp a tool between them, said lower clamping member having a slot with aocircular bottom in its upper face on one sidev of said binding screw, a clamping-jaw having` a circular bottom face movably receivediinsaid recess, said upper clamping member having av toolreceiving recess extended from end, to end Vof it on the same side of the binding-screw, a clamping pin having a spherically-ormed tool-engaging head ixed in the upper wall of the recess in said upper clamping-member` above said clamping jaw, a guide-p in fixed to and extended above said Alower clampingmember on the other side'of said binding-y screw, said upper clamping-member having a recess in which said pin is slidablyrreceived, and a compression spring disposed in said recess and engaging the bottom wall of the recess and the top of said pin.

5. In a tool post for lathes, upper and lower clamping members adapted tov clamp a tool between them, and means to clamp the tool at variousV inclinations therebetween, comprising a clamping-pin having :a spherically Vformed clamping-headcarried by said upperY clamping-member, said lower clamping member having aslot with a circular bottom wall therein below said clampingf pin, a clamping-j aw having a fiat upper face and a lower circular face movably received in said slot and a projection in loose engagement with said lower clamping member arranged movably to retain said clamping jaw in its slot, and means to force and guide said clamping-members towards each other to clamp a tool therebetween. v Y y In testimony whereof, I have signed my name to this specification. s s Y HENRI HALDY. 

